| Motion of single wandering diblock-macromolecules directed by a PTFE nano-fence: real time SFM observations. | |
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MedLine Citation:
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PMID: 19842476 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Using SFM we have observed a peculiar twisting motion of diblock macromolecules pre-collapsed in ethanol vapour during their subsequent spreading in water vapour. The intrinsic asymmetry of the diblock macromolecules has been considered to be the reason for such twisting. Further, friction-deposited PTFE nano-stripes have been employed as nano-trails with the purpose of inducing lateral directed motion of the asymmetric diblock macromolecules under cyclic impact from the changing vapour surroundings. Indeed, some of the macromolecules have demonstrated a certain tendency to orient along the PTFE stripes, and some of the oriented ones have moved occasionally in a directed manner along the trail. However, it has been difficult to reliably record such directed motion at the single molecule level due to some mobility of the PTFE nano-trails themselves in the changing vapour environment. In vapours, the PTFE stripes have demonstrated a distinct tendency towards conjunction. This tendency has manifested itself in efficient expelling of groups of the mobile brush-like molecules from the areas between two PTFE stripes joining in a zip-fastener manner. This different kind of vapour-induced cooperative macromolecular motion has been reliably observed as being directed. The PTFE nano-frame experiences some deformation when constraining the spreading macromolecules. We have estimated the possible force causing such deformation of the PTFE fence. The force has been found to be a few pN as calculated by a partial contribution from every single molecule of the constrained group. |
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Authors:
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Marat O Gallyamov; Shuhui Qin; Krzysztof Matyjaszewski; Alexei Khokhlov; Martin M??ller |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Physical chemistry chemical physics : PCCP Volume: 11 ISSN: 1463-9076 ISO Abbreviation: Phys Chem Chem Phys Publication Date: 2009 Jul |
Date Detail:
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Created Date: 2009-10-21 Completed Date: 2009-12-17 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100888160 Medline TA: Phys Chem Chem Phys Country: England |
Other Details:
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Languages: eng Pagination: 5591-7 Citation Subset: - |
Affiliation:
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Faculty of Physics, Lomonosov Moscow State University, Leninskie gory 1-2, GSP-1, 119991, Moscow, Russia. glm@spm.phys.msu.ru |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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